<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <title>Title</title>
        <style>
            .box1 {
                width: 200px;
                height: 200px;
                background-color: #bfa;
            }

            /*
				        修复子元素和父元素外边距重叠带来的问题(推荐,无副作用)
			      */
            /*.box1::before {*/
            /*	content: '';*/
            /*	display: table;*/
            /*}*/

            .box2 {
                width: 100px;
                height: 100px;
                background-color: orange;
                margin-top: 100px;
            }

            /*
				      终结解决方案,解决父元素下的子元素高度塌陷和外边距重叠
			      */
            .clearfix::before,
            .clearfix::after {
                content: '';
                display: table;
                clear: both;
            }
        </style>
    </head>
    <body>
        <div class="box1 clearfix">
            <div class="box2"></div>
        </div>
    </body>
</html>
